Re: [PATCH 15/16] worker: simplify RedCompressBuf

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> 
> Hi
> 
> On Tue, Nov 10, 2015 at 3:16 PM, Frediano Ziglio <fziglio@xxxxxxxxxx> wrote:
> > From: Christophe Fergeau <cfergeau@xxxxxxxxxx>
> >
> > Make sure an allocated buffer is correctly referenced by the marshaller,
> > and can't be free and reused by mistake. Simplify the code by using
> > GSlice
> 
> Please wait until Christophe confirm he wrote this patch. (I bet it
> was rather me looking at the style of the patch ;)
> 
> 

Ok. Could be that you wrote the patch but then Christophe edited a bit
(actually there are some lines difference between the one you posted
the link to and the one on my branch but yours is older).

Frediano

> > ---
> >  server/display-channel.h |   3 --
> >  server/red_worker.c      | 117
> >  ++++++++++++-----------------------------------
> >  2 files changed, 28 insertions(+), 92 deletions(-)
> >
> > diff --git a/server/display-channel.h b/server/display-channel.h
> > index f1f4e3a..f45860c 100644
> > --- a/server/display-channel.h
> > +++ b/server/display-channel.h
> > @@ -73,7 +73,6 @@
> >  typedef struct RedCompressBuf RedCompressBuf;
> >  struct RedCompressBuf {
> >      uint8_t buf[64 * 1024];
> > -    RedCompressBuf *next;
> >      RedCompressBuf *send_next;
> >  };
> >
> > @@ -179,8 +178,6 @@ struct DisplayChannelClient {
> >          uint32_t stream_outbuf_size;
> >          uint8_t *stream_outbuf; // caution stream buffer is also used as
> >          compress bufs!!!
> >
> > -        RedCompressBuf *used_compress_bufs;
> > -
> >          FreeList free_list;
> >          uint64_t pixmap_cache_items[MAX_DRAWABLE_PIXMAP_CACHE_ITEMS];
> >          int num_pixmap_cache_items;
> > diff --git a/server/red_worker.c b/server/red_worker.c
> > index 5daca87..e0d9593 100644
> > --- a/server/red_worker.c
> > +++ b/server/red_worker.c
> > @@ -3462,16 +3462,27 @@ static void
> > red_push_surface_image(DisplayChannelClient *dcc, int surface_id)
> >      red_channel_client_push(RED_CHANNEL_CLIENT(dcc));
> >  }
> >
> > +static RedCompressBuf *compress_buf_new(void)
> > +{
> > +    return g_slice_new(RedCompressBuf);
> > +}
> > +
> > +static void compress_buf_free(RedCompressBuf *buf)
> > +{
> > +    g_slice_free(RedCompressBuf, buf);
> > +}
> > +
> >  static void marshaller_add_compressed(SpiceMarshaller *m,
> >                                        RedCompressBuf *comp_buf, size_t
> >                                        size)
> >  {
> >      size_t max = size;
> >      size_t now;
> >      do {
> > -        spice_assert(comp_buf);
> > +        spice_return_if_fail(comp_buf);
> >          now = MIN(sizeof(comp_buf->buf), max);
> >          max -= now;
> > -        spice_marshaller_add_ref(m, (uint8_t*)comp_buf->buf, now);
> > +        spice_marshaller_add_ref_full(m, (uint8_t*)comp_buf->buf, now,
> > +
> > (spice_marshaller_item_free_func)compress_buf_free,
> > NULL);
> >          comp_buf = comp_buf->send_next;
> >      } while (max);
> >  }
> > @@ -3506,66 +3517,6 @@ static inline void fill_palette(DisplayChannelClient
> > *dcc,
> >      }
> >  }
> >
> > -static inline RedCompressBuf
> > *red_display_alloc_compress_buf(DisplayChannelClient *dcc)
> > -{
> > -    DisplayChannel *display_channel = DCC_TO_DC(dcc);
> > -    RedCompressBuf *ret;
> > -
> > -    if (display_channel->free_compress_bufs) {
> > -        ret = display_channel->free_compress_bufs;
> > -        display_channel->free_compress_bufs = ret->next;
> > -    } else {
> > -        ret = spice_new(RedCompressBuf, 1);
> > -    }
> > -
> > -    ret->next = dcc->send_data.used_compress_bufs;
> > -    dcc->send_data.used_compress_bufs = ret;
> > -    return ret;
> > -}
> > -
> > -static inline void __red_display_free_compress_buf(DisplayChannel *dc,
> > -                                                   RedCompressBuf *buf)
> > -{
> > -    buf->next = dc->free_compress_bufs;
> > -    dc->free_compress_bufs = buf;
> > -}
> > -
> > -static void red_display_free_compress_buf(DisplayChannelClient *dcc,
> > -                                          RedCompressBuf *buf)
> > -{
> > -    DisplayChannel *display_channel = DCC_TO_DC(dcc);
> > -    RedCompressBuf **curr_used = &dcc->send_data.used_compress_bufs;
> > -
> > -    for (;;) {
> > -        spice_assert(*curr_used);
> > -        if (*curr_used == buf) {
> > -            *curr_used = buf->next;
> > -            break;
> > -        }
> > -        curr_used = &(*curr_used)->next;
> > -    }
> > -    __red_display_free_compress_buf(display_channel, buf);
> > -}
> > -
> > -static void red_display_reset_compress_buf(DisplayChannelClient *dcc)
> > -{
> > -    while (dcc->send_data.used_compress_bufs) {
> > -        RedCompressBuf *buf = dcc->send_data.used_compress_bufs;
> > -        dcc->send_data.used_compress_bufs = buf->next;
> > -        __red_display_free_compress_buf(DCC_TO_DC(dcc), buf);
> > -    }
> > -}
> > -
> > -static void red_display_destroy_compress_bufs(DisplayChannel
> > *display_channel)
> > -{
> > -    spice_assert(!red_channel_is_connected(RED_CHANNEL(display_channel)));
> > -    while (display_channel->free_compress_bufs) {
> > -        RedCompressBuf *buf = display_channel->free_compress_bufs;
> > -        display_channel->free_compress_bufs = buf->next;
> > -        free(buf);
> > -    }
> > -}
> > -
> >  /******************************************************
> >   *      Global lz red drawables routines
> >  *******************************************************/
> > @@ -3890,9 +3841,7 @@ static int encoder_usr_more_space(EncoderData
> > *enc_data, uint8_t **io_ptr)
> >  {
> >      RedCompressBuf *buf;
> >
> > -    if (!(buf = red_display_alloc_compress_buf(enc_data->dcc))) {
> > -        return 0;
> > -    }
> > +    buf = compress_buf_new();
> >      enc_data->bufs_tail->send_next = buf;
> >      enc_data->bufs_tail = buf;
> >      buf->send_next = NULL;
> > @@ -4152,7 +4101,7 @@ static inline int
> > red_glz_compress_image(DisplayChannelClient *dcc,
> >      int glz_size;
> >      int zlib_size;
> >
> > -    glz_data->data.bufs_tail = red_display_alloc_compress_buf(dcc);
> > +    glz_data->data.bufs_tail = compress_buf_new();
> >      glz_data->data.bufs_head = glz_data->data.bufs_tail;
> >
> >      if (!glz_data->data.bufs_head) {
> > @@ -4173,7 +4122,7 @@ static inline int
> > red_glz_compress_image(DisplayChannelClient *dcc,
> >
> >      glz_size = glz_encode(dcc->glz, type, src->x, src->y,
> >                            (src->flags & SPICE_BITMAP_FLAGS_TOP_DOWN),
> >                            NULL, 0,
> > -                          src->stride,
> > (uint8_t*)glz_data->data.bufs_head->buf,
> > +                          src->stride, glz_data->data.bufs_head->buf,
> >                            sizeof(glz_data->data.bufs_head->buf),
> >                            glz_drawable_instance,
> >                            &glz_drawable_instance->glz_instance);
> > @@ -4188,7 +4137,7 @@ static inline int
> > red_glz_compress_image(DisplayChannelClient *dcc,
> >  #endif
> >      zlib_data = &worker->zlib_data;
> >
> > -    zlib_data->data.bufs_tail = red_display_alloc_compress_buf(dcc);
> > +    zlib_data->data.bufs_tail = compress_buf_new();
> >      zlib_data->data.bufs_head = zlib_data->data.bufs_tail;
> >
> >      if (!zlib_data->data.bufs_head) {
> > @@ -4203,7 +4152,7 @@ static inline int
> > red_glz_compress_image(DisplayChannelClient *dcc,
> >      zlib_data->data.u.compressed_data.size_left = glz_size;
> >
> >      zlib_size = zlib_encode(worker->zlib, display_channel->zlib_level,
> > -                            glz_size,
> > (uint8_t*)zlib_data->data.bufs_head->buf,
> > +                            glz_size, zlib_data->data.bufs_head->buf,
> >                              sizeof(zlib_data->data.bufs_head->buf));
> >
> >      // the compressed buffer is bigger than the original data
> > @@ -4211,7 +4160,7 @@ static inline int
> > red_glz_compress_image(DisplayChannelClient *dcc,
> >          while (zlib_data->data.bufs_head) {
> >              RedCompressBuf *buf = zlib_data->data.bufs_head;
> >              zlib_data->data.bufs_head = buf->send_next;
> > -            red_display_free_compress_buf(dcc, buf);
> > +            compress_buf_free(buf);
> >          }
> >          goto glz;
> >      }
> > @@ -4250,7 +4199,7 @@ static inline int
> > red_lz_compress_image(DisplayChannelClient *dcc,
> >      stat_time_t start_time = stat_now(worker);
> >  #endif
> >
> > -    lz_data->data.bufs_tail = red_display_alloc_compress_buf(dcc);
> > +    lz_data->data.bufs_tail = compress_buf_new();
> >      lz_data->data.bufs_head = lz_data->data.bufs_tail;
> >
> >      if (!lz_data->data.bufs_head) {
> > @@ -4264,7 +4213,7 @@ static inline int
> > red_lz_compress_image(DisplayChannelClient *dcc,
> >          while (lz_data->data.bufs_head) {
> >              RedCompressBuf *buf = lz_data->data.bufs_head;
> >              lz_data->data.bufs_head = buf->send_next;
> > -            red_display_free_compress_buf(dcc, buf);
> > +            compress_buf_free(buf);
> >          }
> >          return FALSE;
> >      }
> > @@ -4278,7 +4227,7 @@ static inline int
> > red_lz_compress_image(DisplayChannelClient *dcc,
> >      size = lz_encode(lz, type, src->x, src->y,
> >                       !!(src->flags & SPICE_BITMAP_FLAGS_TOP_DOWN),
> >                       NULL, 0, src->stride,
> > -                     (uint8_t*)lz_data->data.bufs_head->buf,
> > +                     lz_data->data.bufs_head->buf,
> >                       sizeof(lz_data->data.bufs_head->buf));
> >
> >      // the compressed buffer is bigger than the original data
> > @@ -4353,7 +4302,7 @@ static int
> > red_jpeg_compress_image(DisplayChannelClient *dcc, SpiceImage *dest,
> >          return FALSE;
> >      }
> >
> > -    jpeg_data->data.bufs_tail = red_display_alloc_compress_buf(dcc);
> > +    jpeg_data->data.bufs_tail = compress_buf_new();
> >      jpeg_data->data.bufs_head = jpeg_data->data.bufs_tail;
> >
> >      if (!jpeg_data->data.bufs_head) {
> > @@ -4368,7 +4317,7 @@ static int
> > red_jpeg_compress_image(DisplayChannelClient *dcc, SpiceImage *dest,
> >          while (jpeg_data->data.bufs_head) {
> >              RedCompressBuf *buf = jpeg_data->data.bufs_head;
> >              jpeg_data->data.bufs_head = buf->send_next;
> > -            red_display_free_compress_buf(dcc, buf);
> > +            compress_buf_free(buf);
> >          }
> >          return FALSE;
> >      }
> > @@ -4391,7 +4340,7 @@ static int
> > red_jpeg_compress_image(DisplayChannelClient *dcc, SpiceImage *dest,
> >      }
> >      jpeg_size = jpeg_encode(jpeg, display_channel->jpeg_quality,
> >      jpeg_in_type,
> >                              src->x, src->y, NULL,
> > -                            0, stride,
> > (uint8_t*)jpeg_data->data.bufs_head->buf,
> > +                            0, stride, jpeg_data->data.bufs_head->buf,
> >                              sizeof(jpeg_data->data.bufs_head->buf));
> >
> >      // the compressed buffer is bigger than the original data
> > @@ -4417,7 +4366,7 @@ static int
> > red_jpeg_compress_image(DisplayChannelClient *dcc, SpiceImage *dest,
> >
> >      comp_head_filled = jpeg_size % sizeof(lz_data->data.bufs_head->buf);
> >      comp_head_left = sizeof(lz_data->data.bufs_head->buf) -
> >      comp_head_filled;
> > -    lz_out_start_byte = ((uint8_t *)lz_data->data.bufs_head->buf) +
> > comp_head_filled;
> > +    lz_out_start_byte = lz_data->data.bufs_head->buf + comp_head_filled;
> >
> >      lz_data->data.dcc = dcc;
> >
> > @@ -4553,13 +4502,8 @@ static inline int
> > red_quic_compress_image(DisplayChannelClient *dcc, SpiceImage
> >          return FALSE;
> >      }
> >
> > -    quic_data->data.bufs_tail = red_display_alloc_compress_buf(dcc);
> > +    quic_data->data.bufs_tail = compress_buf_new();
> >      quic_data->data.bufs_head = quic_data->data.bufs_tail;
> > -
> > -    if (!quic_data->data.bufs_head) {
> > -        return FALSE;
> > -    }
> > -
> >      quic_data->data.bufs_head->send_next = NULL;
> >      quic_data->data.dcc = dcc;
> >
> > @@ -4567,7 +4511,7 @@ static inline int
> > red_quic_compress_image(DisplayChannelClient *dcc, SpiceImage
> >          while (quic_data->data.bufs_head) {
> >              RedCompressBuf *buf = quic_data->data.bufs_head;
> >              quic_data->data.bufs_head = buf->send_next;
> > -            red_display_free_compress_buf(dcc, buf);
> > +            compress_buf_free(buf);
> >          }
> >          return FALSE;
> >      }
> > @@ -5047,7 +4991,6 @@ static void fill_attr(SpiceMarshaller *m,
> > SpiceLineAttr *attr, uint32_t group_id
> >
> >  static inline void red_display_reset_send_data(DisplayChannelClient *dcc)
> >  {
> > -    red_display_reset_compress_buf(dcc);
> >      dcc->send_data.free_list.res->count = 0;
> >      dcc->send_data.num_pixmap_cache_items = 0;
> >      memset(dcc->send_data.free_list.sync, 0,
> >      sizeof(dcc->send_data.free_list.sync));
> > @@ -7274,14 +7217,10 @@ static void
> > display_channel_client_on_disconnect(RedChannelClient *rcc)
> >      red_release_glz(dcc);
> >      red_reset_palette_cache(dcc);
> >      free(dcc->send_data.stream_outbuf);
> > -    red_display_reset_compress_buf(dcc);
> >      free(dcc->send_data.free_list.res);
> >      dcc_destroy_stream_agents(dcc);
> >
> >      // this was the last channel client
> > -    if (!red_channel_is_connected(rcc->channel)) {
> > -        red_display_destroy_compress_bufs(display);
> > -    }
> >      spice_debug("#draw=%d, #red_draw=%d, #glz_draw=%d",
> >                  display->drawable_count, worker->red_drawable_count,
> >                  worker->glz_drawable_count);

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